diff --git a/pyproject.toml b/pyproject.toml
index 6e595e00..dc9951dd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,5 +28,8 @@ build-backend = "setuptools.build_meta"
 dev-dependencies = [
     "mypy>=1.11.1",
     "pylint>=3.2.6",
+    "flake8>=7.1.1",
+    "isort>=5.13.2",
+    "autopep8>=2.3.1",
 ]
 
diff --git a/requirements-dev.lock b/requirements-dev.lock
index c5f6d4a4..9e93dc80 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -14,23 +14,31 @@ astroid==3.2.4
     # via pylint
 async-timeout==4.0.3
     # via redis
+autopep8==2.3.1
 certifi==2024.7.4
     # via requests
 charset-normalizer==3.3.2
     # via requests
 dill==0.3.8
     # via pylint
+flake8==7.1.1
 idna==3.7
     # via requests
 isort==5.13.2
     # via pylint
 mccabe==0.7.0
+    # via flake8
     # via pylint
 mypy==1.11.1
 mypy-extensions==1.0.0
     # via mypy
 platformdirs==4.2.2
     # via pylint
+pycodestyle==2.12.1
+    # via autopep8
+    # via flake8
+pyflakes==3.2.0
+    # via flake8
 pylint==3.2.6
 pymemcache==4.0.0
     # via spotipy
@@ -39,6 +47,7 @@ redis==5.0.8
 requests==2.32.3
     # via spotipy
 tomli==2.0.1
+    # via autopep8
     # via mypy
     # via pylint
 tomlkit==0.13.0
diff --git a/spotipy/cache_handler.py b/spotipy/cache_handler.py
index aba593b9..610482da 100644
--- a/spotipy/cache_handler.py
+++ b/spotipy/cache_handler.py
@@ -1,22 +1,26 @@
 __all__ = [
-    'CacheHandler',
-    'CacheFileHandler',
-    'DjangoSessionCacheHandler',
-    'FlaskSessionCacheHandler',
-    'MemoryCacheHandler',
-    'RedisCacheHandler',
-    'MemcacheCacheHandler']
+    "CacheHandler",
+    "CacheFileHandler",
+    "DjangoSessionCacheHandler",
+    "FlaskSessionCacheHandler",
+    "MemoryCacheHandler",
+    "RedisCacheHandler",
+    "MemcacheCacheHandler",
+]
 
 import errno
 import json
 import logging
 import os
 from abc import ABC, abstractmethod
-from .util import CLIENT_CREDS_ENV_VARS
-from typing import Dict, Union
+from json import JSONEncoder
+from pathlib import Path
+from typing import Dict, Optional, Type, Union
 
 from redis import RedisError
 
+from .util import CLIENT_CREDS_ENV_VARS
+
 logger = logging.getLogger(__name__)
 
 TokenInfoType = Dict[str, Union[str, int]]
@@ -33,7 +37,7 @@ class CacheHandler(ABC):
     """
 
     @abstractmethod
-    def get_cached_token(self) -> TokenInfoType:
+    def get_cached_token(self) -> Optional[TokenInfoType]:
         """Get and return a token_info dictionary object."""
 
     @abstractmethod
@@ -42,42 +46,38 @@ def save_token_to_cache(self, token_info: TokenInfoType) -> None:
 
 
 class CacheFileHandler(CacheHandler):
-    """
-    Handles reading and writing cached Spotify authorization tokens
-    as json files on disk.
-    """
-
-    def __init__(self,
-                 cache_path=None,
-                 username=None,
-                 encoder_cls=None):
+    """Read and write cached Spotify authorization tokens as json files on disk."""
+
+    def __init__(
+        self,
+        cache_path: Optional[str] = None,
+        username: Optional[str] = None,
+        encoder_cls: Optional[Type[JSONEncoder]] = None,
+    ) -> None:
         """
-        Parameters:
-             * cache_path: May be supplied, will otherwise be generated
-                           (takes precedence over `username`)
-             * username: May be supplied or set as environment variable
-                         (will set `cache_path` to `.cache-{username}`)
-             * encoder_cls: May be supplied as a means of overwriting the
-                        default serializer used for writing tokens to disk
+        Initialize CacheFileHandler instance.
+
+        :param cache_path: (Optional) Path to cache. (Will override 'username')
+        :param username: (Optional) Client username. (Can also be supplied via env var.)
+        :param encoder_cls: (Optional) JSON encoder class to override default.
         """
         self.encoder_cls = encoder_cls
-        if cache_path:
-            self.cache_path = cache_path
-        else:
-            cache_path = ".cache"
-            username = (username or os.getenv(CLIENT_CREDS_ENV_VARS["client_username"]))
-            if username:
-                cache_path += "-" + str(username)
-            self.cache_path = cache_path
 
-    def get_cached_token(self):
-        token_info = None
+        username = username or os.getenv(CLIENT_CREDS_ENV_VARS["client_username"])
+
+        self.cache_path = (
+            cache_path
+            if cache_path is not None
+            else ".cache" + (f"-{username}" if username is not None else "")
+        )
+
+    def get_cached_token(self) -> Optional[TokenInfoType]:
+        """Get cached token from file."""
+        token_info: Optional[TokenInfoType] = None
 
         try:
-            f = open(self.cache_path)
-            token_info_string = f.read()
-            f.close()
-            token_info = json.loads(token_info_string)
+            with Path(self.cache_path).open("r") as f:
+                token_info = json.load(f)
 
         except OSError as error:
             if error.errno == errno.ENOENT:
@@ -87,14 +87,13 @@ def get_cached_token(self):
 
         return token_info
 
-    def save_token_to_cache(self, token_info):
+    def save_token_to_cache(self, token_info: TokenInfoType) -> None:
+        """Save token cache to file."""
         try:
-            f = open(self.cache_path, "w")
-            f.write(json.dumps(token_info, cls=self.encoder_cls))
-            f.close()
+            with Path(self.cache_path).open("w") as f:
+                json.dump(token_info, f, cls=self.encoder_cls)
         except OSError:
-            logger.warning('Couldn\'t write token to cache at: %s',
-                           self.cache_path)
+            logger.warning("Couldn't write token to cache at: %s", self.cache_path)
 
 
 class MemoryCacheHandler(CacheHandler):